2 * Copyright (c) 1995, 1996, 1997, 2002 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
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57 #include <afsconfig.h>
58 #include <afs/param.h>
63 #ifdef IGNORE_SOME_GCC_WARNINGS
64 # pragma GCC diagnostic warning "-Wimplicit-function-declaration"
70 #include <hcrypto/md4.h>
71 #include <hcrypto/md5.h>
73 #include "lifetimes.h"
76 #include "v5gen-rewrite.h"
83 * Principal conversion Taken from src/lib/krb5/krb/conv_princ from MIT Kerberos. If you
84 * find a need to change the services here, please consider opening a
85 * bug with MIT by sending mail to krb5-bugs@mit.edu.
95 #define DO_REALM_CONVERSION 0x00000001
98 * Kadmin doesn't do realm conversion because it's currently
99 * kadmin/REALM.NAME. Zephyr doesn't because it's just zephyr/zephyr.
101 * "Realm conversion" is a bit of a misnomer; really, the v5 name is
102 * using a FQDN or something that looks like it, where the v4 name is
103 * just using the first label. Sometimes that second principal name
104 * component is a hostname, sometimes the realm name, sometimes it's
107 * This list should probably be more configurable, and more than
108 * likely on a per-realm basis, so locally-defined services can be
111 static const struct krb_convert sconv_list[] = {
112 /* Realm conversion, Change service name */
113 #define RC(V5NAME,V4NAME) { V5NAME, V4NAME, DO_REALM_CONVERSION, sizeof(V5NAME)-1 }
114 /* Realm conversion */
115 #define R(NAME) { NAME, NAME, DO_REALM_CONVERSION, sizeof(NAME)-1 }
116 /* No Realm conversion */
117 #define NR(NAME) { NAME, NAME, 0, sizeof(NAME)-1 }
168 krb5_des_decrypt(struct ktc_encryptionKey *, int, void *, size_t, void *,
175 tkt_DecodeTicket5(char *ticket, afs_int32 ticket_len,
176 int (*get_key) (void *, int, struct ktc_encryptionKey *),
177 char *get_key_rock, int serv_kvno, char *name, char *inst,
178 char *cell, struct ktc_encryptionKey *session_key, afs_int32 * host,
179 afs_uint32 * start, afs_uint32 * end, afs_int32 disableCheckdot)
181 char plain[MAXKRB5TICKETLEN];
182 struct ktc_encryptionKey serv_key;
183 Ticket t5; /* Must free */
184 EncTicketPart decr_part; /* Must free */
186 size_t siz, plainsiz;
188 char *v5_comp0, *v5_comp1, *c;
189 const struct krb_convert *p;
191 memset(&t5, 0, sizeof(t5));
192 memset(&decr_part, 0, sizeof(decr_part));
197 return RXKADBADTICKET; /* no ticket */
199 if (serv_kvno == RXKAD_TKT_TYPE_KERBEROS_V5) {
200 code = decode_Ticket((unsigned char *)ticket, ticket_len, &t5, &siz);
207 code = decode_EncryptedData((unsigned char *)ticket, ticket_len, &t5.enc_part, &siz);
212 /* If kvno is null, it's probably not included because it was kvno==0
214 if (t5.enc_part.kvno == NULL) {
217 v5_serv_kvno = *t5.enc_part.kvno;
220 /* Check that the key type really fit into 8 bytes */
221 switch (t5.enc_part.etype) {
222 case ETYPE_DES_CBC_CRC:
223 case ETYPE_DES_CBC_MD4:
224 case ETYPE_DES_CBC_MD5:
231 if (t5.enc_part.cipher.length > sizeof(plain)
232 || t5.enc_part.cipher.length % 8 != 0)
235 code = (*get_key) (get_key_rock, v5_serv_kvno, &serv_key);
239 /* Decrypt data here, save in plain, assume it will shrink */
241 krb5_des_decrypt(&serv_key, t5.enc_part.etype,
242 t5.enc_part.cipher.data, t5.enc_part.cipher.length,
248 code = decode_EncTicketPart((unsigned char *)plain, plainsiz, &decr_part, &siz);
252 /* Extract realm and principal */
253 strncpy(cell, decr_part.crealm, MAXKTCNAMELEN);
254 cell[MAXKTCNAMELEN - 1] = '\0';
256 switch (decr_part.cname.name_string.len) {
258 v5_comp0 = decr_part.cname.name_string.val[0];
259 v5_comp1 = decr_part.cname.name_string.val[1];
262 if (strcmp(p->v5_str, v5_comp0) == 0) {
264 * It is, so set the new name now, and chop off
265 * instance's domain name if requested.
267 strncpy(name, p->v4_str, MAXKTCNAMELEN);
268 name[MAXKTCNAMELEN - 1] = '\0';
269 if (p->flags & DO_REALM_CONVERSION) {
270 c = strchr(v5_comp1, '.');
271 if (!c || (c - v5_comp1) >= MAXKTCNAMELEN - 1)
273 strncpy(inst, v5_comp1, c - v5_comp1);
274 inst[c - v5_comp1] = '\0';
282 strncpy(inst, decr_part.cname.name_string.val[1], MAXKTCNAMELEN);
283 inst[MAXKTCNAMELEN - 1] = '\0';
284 strncpy(name, decr_part.cname.name_string.val[0], MAXKTCNAMELEN);
285 name[MAXKTCNAMELEN - 1] = '\0';
289 strncpy(name, decr_part.cname.name_string.val[0], MAXKTCNAMELEN);
290 name[MAXKTCNAMELEN - 1] = '\0';
296 if (!disableCheckdot) {
298 * If the first part of the name_string contains a dot, punt since
299 * then we can't see the diffrence between the kerberos 5
300 * principals foo.root and foo/root later in the fileserver.
302 if (strchr(decr_part.cname.name_string.val[0], '.') != NULL)
306 /* Verify that decr_part.key is of right type */
307 switch (decr_part.key.keytype) {
308 case ETYPE_DES_CBC_CRC:
309 case ETYPE_DES_CBC_MD4:
310 case ETYPE_DES_CBC_MD5:
316 if (decr_part.key.keyvalue.length != 8)
319 /* Extract session key */
320 memcpy(session_key, decr_part.key.keyvalue.data, 8);
322 /* Check lifetimes and host addresses, flags etc */
324 time_t now = time(0); /* Use fast time package instead??? */
325 *start = decr_part.authtime;
326 if (decr_part.starttime)
327 *start = *decr_part.starttime;
329 if (*start - now > CLOCK_SKEW || decr_part.flags.invalid)
332 if (decr_part.flags.invalid)
335 if (now > decr_part.endtime)
337 *end = decr_part.endtime;
341 if (serv_kvno == RXKAD_TKT_TYPE_KERBEROS_V5)
344 free_EncryptedData(&t5.enc_part);
345 free_EncTicketPart(&decr_part);
346 memset(&serv_key, 0, sizeof(serv_key));
350 code = RXKADUNKNOWNKEY;
359 code = RXKADBADTICKET;
365 verify_checksum_md4(void *data, size_t len,
366 void *cksum, size_t cksumsz,
367 struct ktc_encryptionKey *key)
370 unsigned char tmp[16];
373 MD4_Update(&md4, data, len);
374 MD4_Final(tmp, &md4);
376 if (memcmp(tmp, cksum, cksumsz) != 0)
382 verify_checksum_md5(void *data, size_t len,
383 void *cksum, size_t cksumsz,
384 struct ktc_encryptionKey *key)
387 unsigned char tmp[16];
390 MD5_Update(&md5, data, len);
391 MD5_Final(tmp, &md5);
393 if (memcmp(tmp, cksum, cksumsz) != 0)
399 verify_checksum_crc(void *data, size_t len, void *cksum, size_t cksumsz,
400 struct ktc_encryptionKey *key)
405 _rxkad_crc_init_table();
406 crc = _rxkad_crc_update(data, len, 0);
408 r[1] = (crc >> 8) & 0xff;
409 r[2] = (crc >> 16) & 0xff;
410 r[3] = (crc >> 24) & 0xff;
412 if (memcmp(cksum, r, 4) != 0)
419 krb5_des_decrypt(struct ktc_encryptionKey *key, int etype, void *in,
420 size_t insz, void *out, size_t * outsz)
422 int (*cksum_func) (void *, size_t, void *, size_t,
423 struct ktc_encryptionKey *);
428 int ret = 1; /* failure */
432 DES_key_sched(ktc_to_cblock(key), &s);
434 #define CONFOUNDERSZ 8
437 case ETYPE_DES_CBC_CRC:
438 memcpy(&ivec, key, sizeof(ivec));
440 cksum_func = verify_checksum_crc;
442 case ETYPE_DES_CBC_MD4:
443 memset(&ivec, 0, sizeof(ivec));
445 cksum_func = verify_checksum_md4;
447 case ETYPE_DES_CBC_MD5:
448 memset(&ivec, 0, sizeof(ivec));
450 cksum_func = verify_checksum_md5;
456 DES_cbc_encrypt(in, out, insz, &s, &ivec, 0);
458 memcpy(cksum, (char *)out + CONFOUNDERSZ, cksumsz);
459 memset((char *)out + CONFOUNDERSZ, 0, cksumsz);
462 ret = (*cksum_func) (out, insz, cksum, cksumsz, key);
464 *outsz = insz - CONFOUNDERSZ - cksumsz;
465 memmove(out, (char *)out + CONFOUNDERSZ + cksumsz, *outsz);